diffused light - light cone with diffuse filter

F.ip2 · Post by **F.ip2** » Fri Mar 16, 2007 5:08 am

Hi

how would you create a light box with a diffused light so it casts only very soft shadows???

I have an issue rebuilding this - to scatter the light ray directions.

claas

Kram1032 · Post by **Kram1032** » Fri Mar 16, 2007 5:13 am

Maybe -it would need tons of calculation- a sphere as lightsource with an other sphere (this also can be a .sphere) arround the lightsphere: It should have an SSS-mat with 0 absorbtion, but some uniform SSS!

F.ip2 · Post by **F.ip2** » Fri Mar 16, 2007 5:22 am

I see, SSS, I did not think about that. technically you are right.

I made some tests with shooting lights into a light umbrella, wedge gave me the tip, but I had no big success with my results yet.

somehow i needed to crank up the light power significantly!

StompinTom · Post by **StompinTom** » Fri Mar 16, 2007 5:22 am

add cube. scale up. make it a light. done.

the larger the light source, the softer the shadows, the more diffuse the light. all the lightbox is is a very large lightsource (created by putting a flash bulb behind a diffuser so that the diffuser diffuses the light -> bigger lightsource -> softer light).

Kram1032 · Post by **Kram1032** » Fri Mar 16, 2007 5:25 am

an SSS-mat would kinda act as a diffuser, wont it? Just be aware that you'd better use specular SSS that glossytransp-SSS, as 2nd one has energy loss...

CTZn · Post by **CTZn** » Fri Mar 16, 2007 5:32 am

Also very soft shadows mean the light source is quite wide (like an open, overcast sky). So make the light source bigger (yes a sphere can make sense, depending on the scene). Even if light is scattered at the source, light rays won't come from another point than the source itself (obviously

), so size matters !

Kram1032 · Post by **Kram1032** » Fri Mar 16, 2007 5:37 am

*lol*
Size matters not! Judge me on my size do you?....

F.ip2 · Post by **F.ip2** » Fri Mar 16, 2007 2:09 pm

you guys have a size issue, ha?

CTZn · Post by **CTZn** » Fri Mar 16, 2007 2:32 pm

Yes, in my case 1cm=1m

F.ip2 · Post by **F.ip2** » Fri Mar 16, 2007 3:21 pm

well I hope you don't pass out when you get an erec ah eruption

Kram1032 · Post by **Kram1032** » Sat Mar 17, 2007 1:08 am

...=1µm=1m=1cm=1dm=1m=1km=1...

diffused light - light cone with diffuse filter

diffused light - light cone with diffuse filter

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